KR101418114B1 - Method and apparatus for resource assignment using variable size of resource unit in mobile communication system - Google Patents

Abstract

In a mobile communication system, a base station includes at least one resource unit resource or at least one resource unit resource including at least one resource block in consideration of at least one of a channel state and a buffer state of at least one terminal And transmits information about the at least one resource unit resource or information about the at least one resource map to the at least one terminal, and transmits information about the at least one resource unit resource Wherein the at least one resource unit resource includes an indicator indicating the at least one resource unit resource.

OFDM, resource management, control signaling

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for resource allocation using a variable-size resource unit in a mobile communication system,

1 shows a transmitter structure of a general OFDM system;

FIG. 2 conceptually illustrates resources of a general OFDM system; FIG.

3 is a diagram illustrating a frequency band structure when various resource units are taken in accordance with Embodiment 1 of the present invention;

4 is a diagram illustrating a base station operation according to embodiment 1 of the present invention.

5 is a diagram illustrating a terminal operation according to the first embodiment of the present invention.

6 is a block diagram showing a base station transmitting apparatus according to Embodiment 1 of the present invention.

7 is a block diagram showing a terminal device according to the first embodiment of the present invention;

8 is a diagram illustrating a frequency band structure having a resource unit of irregular size according to the second embodiment of the present invention.

9 is a diagram showing an example of a resource map having irregular-sized resource units according to the second embodiment of the present invention;

10 is a diagram illustrating a base station operation according to a third embodiment of the present invention.

11 is a diagram illustrating a terminal operation according to a third embodiment of the present invention.

12 is a block diagram showing a structure of a base station apparatus according to Embodiment 3 of the present invention;

13 is a block diagram showing a structure of a terminal device according to a third embodiment of the present invention;

14 illustrates a method of signaling a resource unit using an indicator according to embodiment 4 of the present invention.

15 is a diagram illustrating a signaling method of a base station according to Embodiment 5 of the present invention.

The present invention relates to an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, and more particularly, to a resource allocation method and apparatus therefor.

2. Description of the Related Art In recent mobile communication systems, an orthogonal frequency division multiple access (OFDM) scheme has been actively studied as a useful method for high-speed data transmission in a wireless channel.

The OFDM scheme is a scheme for transmitting data using a multi-carrier scheme. The OFDM scheme converts a symbol sequence input in a serial manner into parallel symbols and transmits them to a plurality of mutually orthogonal sub- Carriers, that is, a plurality of sub-carrier channels, and transmits the modulated signals.

1 is a diagram illustrating a transmitter structure of a general OFDM system.

1, an OFDM transmitter includes an encoder 101, a modulator 102, a S / P converter 103, an IFFT block 104, a P / S converter 105, and a CP inserter 106 .

The encoder 101 is called a channel encoding block and performs channel encoding by receiving a predetermined information bit stream. In general, a convolutional encoder, a turbo encoder, a low density parity check (LDPC) encoder, or the like is used as the encoder 101.

The modulator 102 performs modulation such as Quadrature Phase Shift Keying (QPSK), 8PSK, 16QAM, 64QAM, and 256QAM.

1, a rate matching block may be additionally provided between the encoder 101 and the modulator 102 to perform repetition and puncturing.

The serial-to-parallel converter 103 takes the output of the modulator 102 as an input and serves to make the signals parallel.

The IFFT (Inverse Fast Fourier Transform) block 104 receives the output of the S / P converter 103 and performs an IFFT operation. The output of the IFFT block 104 is converted to a parallel / serial converter 105. The CP inserter 106 inserts a cyclic prefix (CP) into the output signal of the P / S converter 105.

When the OFDM scheme is used, the wireless resource can be expressed as a two-dimensional array of time axes and frequency axes. For example, in the LTE (Long Term Evolution) system, which is an OFDM communication system, resource representation as shown in FIG.

2 is a diagram conceptually showing resources of a general OFDM system.

Referring to FIG. 2, the horizontal axis indicates the time axis 201 and the vertical axis indicates the frequency axis 202. 7 OFDM symbols are referred to as one slot 204 on the time axis, and two slots are grouped to form a subframe 205. Generally, the one subframe 205 has a length equal to the TTI which is a basic transmission unit.

12 subcarriers are grouped for the entire frequency band 203 and resources corresponding to one TTI period are represented by one physical resource block (PRB) 206, .

The PRB refers to a minimum resource unit that can be allocated for data transmission. A base station allocates one or more PRBs to the UE through scheduling to enable data transmission.

A method of allocating resources using the PRB may be a localized transmission scheme or a distributed transmission scheme.

In the local transmission scheme, one or a plurality of terminals of the PRB are allocated to receive data from all of the allocated PRBs. The local transmission scheme is used for a low rate terminal to increase the frequency selective scheduling gain.

On the other hand, the distributed transmission scheme is a scheme in which the MSs are used to maximize the frequency diversity gain, and a plurality of MSs share one PRB. That is, a plurality of PRBs are grouped together and a plurality of terminals are mixed with the PRBs and used together to obtain a frequency diversity gain.

For example, three PRBs that are as far as possible on the frequency side are allocated to three UEs, and the three UEs share and use the three PRBs so that one UE can allocate as many resources as one PRB The frequency diversity effect can be obtained.

For the local transmission method, the BS allocates a necessary number of PRBs to each MS. One or more PRBs may be allocated to one MS in consideration of the state of the MS and the state of the BS. If a plurality of PRBs are allocated to one UE, the frequency selective scheduling gain can be maximized when the position of the PRB to be allocated can be arbitrarily set.

However, in order to arbitrarily set the position of the PRB to one terminal as described above, signaling such as a bitmap (BITMAP) method is required. In the bitmap method, the number of bits corresponding to the number of all PRBs And the signaling overhead is increased because the information must be transmitted using the information.

For example, in the case of an LTE system having a 10 MHz system band, 50 PRBs exist. Assuming the bitmap method for one PRB unit, 50 bits of information must be used for resource allocation to one UE.

In a wireless communication system using a limited resource, it can be said that the control signal, that is, the signaling overhead due to the resource information transmission is very large.

Therefore, there is a need for a method capable of reducing the signaling overhead for resource allocation while maximizing the frequency selective scheduling gain in a wireless communication system.

The present invention provides a method and apparatus for transmitting resource allocation information in a wireless communication system.

According to another aspect of the present invention, there is provided a method and apparatus for allocating resources using variable-size resource units in a wireless communication system.

In addition, in order to solve the above problems, the present invention provides a method and apparatus for allocating at least one resource block in resource units in consideration of a channel condition of a terminal in a wireless communication system.

According to another aspect of the present invention, there is provided a method and apparatus for allocating at least one resource block on a resource basis in consideration of a buffer state of a terminal in a wireless communication system.

A method according to an embodiment of the present invention comprises: A method for allocating resources by a base station in a mobile communication system, the method comprising the steps of: allocating at least one resource unit resource including at least one resource block or at least one resource unit resource The method comprising the steps of: setting at least one resource map including a resource unit resource; and transmitting information on the at least one resource unit resource or the at least one resource map to the at least one terminal And the information on the at least one resource unit resource includes an indicator indicating the at least one resource unit resource.

Another method according to an embodiment of the present invention comprises: A method for allocating resources by a terminal in a mobile communication system, the method comprising: receiving information about at least one resource unit resource including at least one resource block set considering at least one of a channel status and a buffer status of the terminal, The method comprising the steps of: receiving from a base station information on at least one resource map including resource unit resources of the at least one resource, Wherein the information on the at least one resource unit resource includes an indicator indicating the at least one resource unit resource.

An apparatus according to an embodiment of the present invention includes: A base station in a mobile communication system, comprising at least one resource unit resource including at least one resource block or the at least one resource unit resource, considering at least one of a channel state and a buffer state of at least one terminal, A control unit configured to set at least one resource map, and a transmitting unit transmitting information on the at least one resource unit resource or the at least one resource map to the at least one terminal, And the information on the unit resource includes an indicator indicating the at least one resource unit resource.

Another apparatus according to an embodiment of the present invention includes: In a mobile communication system, a terminal includes information on at least one resource unit resource including at least one resource block set in consideration of at least one of a channel status and a buffer status of the terminal, or the at least one resource unit resource And acquiring a resource allocated to the terminal based on the information on the at least one resource unit resource or the information about the at least one resource map, Wherein the information on the at least one resource unit resource includes an indicator indicating the at least one resource unit resource.

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The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like.

Therefore, the definition should be based on the contents throughout this specification. Meanwhile, although the present invention has been described by taking an LTE system as an example, the present invention can be applied to a wireless communication system to which base station scheduling is applied without adding or subtracting it.

The present invention provides a method for reducing signaling overhead for resource allocation in a wireless communication system. In the wireless communication system, forward resource management according to multiplexing of forward control information and data is proposed.

The present invention proposes a method of optimizing the signaling overhead by changing resource allocation settings in consideration of a channel state or a buffer state of the UEs belonging to a certain cell and using a resource allocation method appropriate for the situation.

Also, in the present invention, the information on the resource allocation setting can be transmitted to all the terminals using the broadcast information, or can be informed to each terminal through the upper signaling ring. In the case of transmission using broadcast information having a certain period even in the case of transmission through the broadcast information, it is possible to use a method in which a resource allocation method determined immediately before is continuously used between the periods, May be transmitted to all terminals using information broadcasted every TTI so as to change the resource allocation method.

≪ Example 1 >

The first embodiment of the present invention proposes a method of using a resource allocation for a terminal as a single resource allocation unit by grouping a plurality of PRBs as needed. That is, an arbitrary base station (or cell) sets a PRB number unit effective for resource allocation in consideration of a situation, and notifies all terminals included in the base station of the unit information. The BS uses an allocation unit of the set PRB size in resource allocation to the MS.

3 is a diagram illustrating a frequency band structure when various resource units are taken in accordance with the first embodiment of the present invention. Referring to FIG. 3, an example of a system having 25 PRBs as shown at 301 is shown.

In FIG. 3, the resource allocation unit 302 represents one PRB. That is, although the setting of 302 is the most flexible in resource allocation and the frequency selective scheduling gain is the greatest, the signaling overhead is the greatest. That is, the number of signaling bits required for resource allocation using a bitmap (BITMAP) scheme for one terminal is 25 bits.

On the other hand, 303 in FIG. 3 shows a resource allocation unit set to two PRBs. Since the total number of PRBs is 25, two PRBs are grouped into 12 groups, and the last group is set as one. That is, if the BS sets the resource allocation unit to two PRBs, the BS performs resource allocation using 13 allocation units as shown at 303. Therefore, 13 bits of signaling are required for each UE.

This can reduce 12-bit signaling compared to allocating a resource in one PRB unit of 302. However, as scheduling is performed in units of two PRBs, a terminal that does not need two PRBs, It is possible to reduce the scheduling performance in a terminal where the PRBs are separated from each other.

3, a resource allocation unit is set to three PRBs. Since the total number of PRBs is 25, 3 PRBs are grouped into 8 groups, and the last group is set as one. That is, if the base station sets the resource allocation unit to three PRBs, the base station performs resource allocation using nine allocation units as shown at 304. Therefore, 9-bit signaling is required for each terminal.

Compared to performing resource allocation using one PRB as in 302 or two PRB units as 303, resource allocation of 304 can reduce the signaling overhead, but of course can lead to a decrease in scheduling performance have.

Accordingly, the present invention proposes that a base station sets a resource allocation unit in consideration of the amount of data desired by the terminals or the channel conditions of the terminals.

4 is a flowchart illustrating a resource allocation procedure and resource allocation process according to the first embodiment of the present invention.

Referring to FIG. 4, when the transmission process 401 starts, the BS determines a channel status, a buffer status, or the like of each of the UEs belonging to the BS in step 402.

In step 403, the BS sets an appropriate resource allocation unit for each MS, and transmits the resource allocation unit information set in step 404 to MSs belonging to the BS in step 404.

Here, if the channel condition of the UE is good and there is a sufficient resource for signaling, the resource allocation unit may have a small unit such as one PRB. That is, a scheme with the highest flexibility in allocating resources and having the highest frequency selective scheduling gain is applied. On the other hand, if the channel status of the UE is good but there is not enough resources for signaling, the resource allocation unit is set with at least one PRB and signaled. As shown in FIG. 3, it can be flexibly allocated in consideration of the channel status and the buffer status of the UE.

The transmission of the resource allocation unit information can be transmitted to all the terminals at once in a broadcast manner or can be informed to each terminal through higher signaling.

In step 405, the BS performs scheduling considering the set resource allocation unit. In step 406, the resource allocation determined through the scheduling is transmitted to the UEs allocated using the signaling corresponding to the set resource allocation unit, and the process is terminated in step 407.

FIG. 5 is a diagram illustrating a terminal operation according to the first embodiment of the present invention. FIG. 5 illustrates an operation procedure in which a terminal receives resource allocation information as a base station changes resource allocation settings.

Referring to FIG. 5, when a terminal operation starts (501), the terminal receives resource allocation unit information transmitted from a base station in step 502.

In step 503, resource allocation information is received through a signaling format conforming to the set resource allocation unit. The resource allocation unit information is transmitted in a broadcast manner or is received through the upper signaling.

For example, all terminals receive the same information through a broadcast channel called cat 0. The cat 0 represents a structure of a signaling channel, and is a term collectively referred to as information to be broadcasted.

Further, the upper signaling is a method of signaling to the terminal by including control information using a data channel for each terminal. For example, RRC information transmission may be referred to as upper signaling. The reason for including the higher signaling in the present invention is to include a situation where a terminal receiving data transmission, i.e., an active state terminal, does not receive broadcast information.

In step 504, the allocated resource is determined using the received resource allocation information, and data transmission and reception are performed using the allocated resource, and then operation is terminated in step 505.

6 is a block diagram showing a transmitting apparatus of a base station according to Embodiment 1 of the present invention.

Referring to FIG. 6, the scheduler 602 determines resource allocation unit information by determining a channel status or a buffer status of the UE, and uses the resource allocation unit information 601 for each of the UEs under its control Resource allocation scheduling is performed. The set resource allocation unit information is stored in the memory unit 601.

The resource allocation information generating unit 603 generates resource allocation information for the UE determined through the scheduling. The resource allocation information generating unit 603 also generates information on an appropriate transmission format according to the set resource allocation unit information 601.

The transmitting unit 604 transmits the generated resource allocation information to the terminal. The generated transmission format information may also be transmitted.

7 is a block diagram showing a terminal device according to the first embodiment of the present invention.

Referring to FIG. 7, a terminal receives a signal transmitted from a base station in a receiving unit 701. The memory 702 stores resource allocation unit information among the received signals.

The resource allocation information decoder 703 decodes a signal received through the receiver 701 according to a predetermined decoding scheme. That is, the resource allocation information is decoded from the received signal.

The acquisition unit 704 confirms whether the resource of the terminal is allocated through the decryption process. That is, when a resource is allocated to the UE, the resource allocated to the UE is obtained using the decoded resource allocation information and the resource allocation unit information stored in the memory 702.

Thereafter, the receiving unit 701 receives data transmitted through the acquired entire resources.

As described above, in the first embodiment, in consideration of the channel condition and the buffer status of the UE, the BS sets the resource allocation unit to one PRB, sets it to two PRBs, or sets a plurality of PRBs larger than the two PRBs Explain how to do this.

In the first embodiment of the present invention, it is not described how to set PRBs of other integer multiples. However, in the present invention, the base station sets PRBs of different constants to one resource allocation unit It is possible. Accordingly, according to the present invention, the number of bits of BITMAP expressing one resource allocation unit is variably set, thereby minimizing the signaling overhead.

Hereinafter, a method of allocating resources using irregular-sized resource units presented by the present invention will be described.

In general, among terminals scheduled at the same time, there may be a terminal requiring a small amount of data and a terminal requiring a large amount of data may be together. Therefore, a UE to be scheduled only for one PRB and a UE to be scheduled for two or more PRBs can exist at the same time.

Also, assuming that the size of the PRB is not very large, there is a difference in channel response between the PRB units according to the channel status of the UE, so that the UEs having similar channel responses of adjacent PRBs exist.

Accordingly, a resource map having irregular-sized resource units as shown in FIG. 8 is constructed in consideration of the situation of the terminal. At this time, a method of assigning resources to a terminal using the same scheme as a bitmap is suggested in the map.

FIG. 8 is a diagram illustrating a frequency band structure having a resource unit of irregular size according to the second embodiment of the present invention, and shows an example of a resource map. The resource units are not fixed to one size and can have various sizes.

Referring to FIG. 8, the entire band (5MH) has 25 PRBs as shown at 801. FIG.

In 802, 805, 808, 811 and 814, the resource allocation units are the same with one PRB size.

On the other hand, in 803, 806, 809 and 812, the resource allocation unit is the same with two PRB sizes.

On the other hand, in 804, 807, 810 and 813, the resource allocation unit is the same with three PRB sizes.

That is, according to the second embodiment, all irregular-sized resources are allocated to terminals by dividing the entire frequency band using resource units having three different sizes.

The benefit of the present invention is that the UEs that are scheduled at the same time may have different sizes of PRBs needed, and therefore a terminal that is allocated resources in the smallest unit (e.g., one unit of PRB size in FIG. 8) , Scheduling for such terminals is possible. Assuming that all the terminals do not require the small unit (one resource allocation unit, for example), and that the channel response between adjacent PRBs is similar, it is also possible to have resource units It is possible.

Accordingly, when scheduling is performed as in the second embodiment, the signaling overhead is reduced, and the channel response can adaptively schedule the same PRBs corresponding to similar terminals.

In addition, according to the embodiment, the resource map having irregular-sized resource units can be variously present depending on the size of the resource unit and the positions occupied by the resources of the respective sizes on the frequency. At this time, it is possible to increase the scheduling gain by spreading the resources of the same size as much as possible over the entire bandwidth.

That is, a desired terminal may select one of resources of 802, 805, 808, 811 and 814 as shown in FIG. 8 for scheduling a resource of a PRB size. Since the resources are dispersed throughout the entire bandwidth, the difference in channel response between the resources can be increased, and the frequency selective scheduling gain can be increased.

FIG. 9 is a diagram showing another example of a resource map having irregular-sized resource units according to the second embodiment of the present invention.

Referring to FIG. 9, all four resource maps are configured to represent bitmaps using only 13 bits using a frequency band having 25 PRBs.

In FIG. 9, it can be seen that all the resources of the same size are not collected on the frequency, but are spread over the entire bandwidth. Also, the resource map can be different in the size of the resource unit used and the number of resources of each size. Thus, there is a gain in frequency selective scheduling.

In FIG. 9, reference numeral 901 denotes a 4-PRB size unit (0, 4, 8, 12), 6 PRB size units (1, 3, 5, 7, 9, 11) (2, 6, 10).

902 and 903 are the same in terms of five PRB 1 size units, 4 PRB 2 size units, and 4 PRB 3 size units, but they are divided according to the positions of resources of respective sizes.

In this case, reference numeral 902 denotes a resource allocation unit in which 0, 3, 6, 9 and 12 are set to one PRB, 1, 4, 7 and 10 are set to two PRBs, and 2, 5, Are set to three PRBs. On the other hand, reference numeral 903 denotes a resource allocation unit in which 1, 4, 7, 11 and 12 are set to one PRB, 2, 5, 8 and 10 are set to two PRBs, 0, 3, 6 and 9 It is set to three PRBs.

On the other hand, 904 consists of 9 PRB size units and 4 PRB size units, which are different from the previous 901, 902, and 903, and one PRB size (0, 2, 3, 5, 6, , 11, and 12) and resource allocation units of four PRB sizes (1, 4, 7, and 10). In the above, resource allocation units may be other than 1, 2, 3, or 4.

10 to 13, a process of allocating resources using resource maps having irregular-sized resource units of FIGS. 8 and 9 will be described.

≪ Example 2 >

In the second embodiment of the present invention, a method of setting a resource map directly to a terminal by a base station is presented. In the second exemplary embodiment of the present invention, the base station determines a resource map to be set for a predetermined interval and notifies all terminals that are allocated resources from the base station. The base station informs the terminal of the resource map information, There is a method of transmitting to all terminals using a signaling method and a method of notifying each terminal through upper signaling.

In the case of transmitting through the broadcast information and using broadcast information having an arbitrary period, the previously set resource map is continuously used during the period.

Alternatively, the resource map information may be transmitted to all terminals using information (Cat 0 information used in LTE) broadcasted every TTI so that resource maps can be changed for each TTI.

The base station sets a suitable resource map according to the situation by using the resource size information required by the terminal to which the resource is allocated and the channel state information (CQI) do.

In addition, a method of expressing the structure of the resource map itself by a method of expressing the resource map in the process of transmitting the resource map to the terminal, or a method of predetermining a plurality of arbitrary resource maps, A method of setting a resource map by transmitting an indicator indicating that the resource map is used can be used.

In a case where a plurality of resource maps are predetermined, a method of reducing the signaling overhead by setting the allowable resource map itself among the available resource maps to the terminal, thereby reducing the number of allowable resource maps and designating one resource map therein Can also be used.

The base station and the terminal operation and the base station and the apparatus diagram according to the second embodiment of the present invention can be used in the same way as the base station and the terminal operation and the base station and the apparatus diagram according to the first embodiment. In the second embodiment of the present invention, the part to be analyzed is set to the size of the resource unit, and the part set by the base station and interpreted by the terminal is changed to the resource map and operated.

≪ Example 3 >

Further, in the third embodiment of the present invention, the base station does not set the resource map every time, but uses a predetermined resource map in advance, and uses another resource map according to the time.

The base station and the terminal store a plurality of predetermined resource maps in the memory, and the base station and the terminal share information on which resource map is used in a predetermined time interval according to the time information.

For example, if the resource map is assumed to use the four resources shown in FIG. 9, the BS and the MS can sequentially use resource maps 901, 902, 903, and 904 in FIG. 9 according to the TTI.

Also, in the case of using a different resource map according to time, the base station and the terminal may store a predetermined resource map for a possible resource map, or a plurality of resource maps that are available through upper signaling or broadcast information You can also use a method to tell each configuration.

In the case of using various kinds of resource maps, the following method can be used as a reference for setting a resource map. That is, the resource units of the same size are set to be located at different positions as far as other resource maps, and the resource units of an arbitrary size are positioned over the entire band as time passes.

If a resource map in which a resource unit having a different size is located at a frequency position of the most preferred frequency at the current time point is used, The resource can be allocated to the terminal at a time when the resource is set. Using the resource map as described above, it is advantageous to improve the system performance rather than the transmission delay.

FIG. 10 is a diagram illustrating a base station operation according to a third embodiment of the present invention. The base station allocates resources to terminals according to the resource allocation method shown in FIG. 8 and FIG.

Referring to FIG. 10, when a transmission process is started in step 1001, the BS determines current time information in step 1002. FIG. The current time information may be a TTI, a system frame number, or the like.

In step 1003, the BS sets a resource map determined according to the time information, and performs scheduling for a plurality of MSs using the set resource map in step 1004. For example, if the resource map is assumed to use the four resources shown in FIG. 9, the BS and the MS can sequentially use the resource map 901, the resource maps 902, 903, and 904 according to the TTI. At this time, the resource map to be used may be transmitted through the indicator.

In step 1005, the resource allocation determined through the scheduling is transmitted to the UEs allocated using the signaling, and the process ends in step 1006.

FIG. 11 is a diagram illustrating a terminal operation according to the third embodiment of the present invention. The terminal receives resource allocation information according to the resource allocation method as shown in FIGS. 8 and 9, Show the process.

Referring to FIG. 11, when the UE starts operating in step 1101, the UE determines the current time information in step 1102. FIG. Here, the current time information may be a TTI, a system frame number, or the like.

In step 1103, the terminal sets a resource map corresponding to the current time information. In step 1104, resource allocation signaling transmitted from the base station is received and decoded to receive resource allocation information.

In step 1105, the MS determines the resource allocated to itself by checking the received resource allocation information according to the set resource map.

In step 1106, data is transmitted and received using the allocated resources, and the operation is terminated in step 1107.

FIG. 12 is a block diagram illustrating a structure of a base station apparatus according to a third embodiment of the present invention, and shows a transmission apparatus of a base station according to a resource allocation method as shown in FIGS. 8 and 9.

Referring to FIG. 12, the base station transmitter stores all possible resource maps in the memory 1201. The resource maps may have a predetermined resource map stored therein or a resource map determined according to the setting of the base station.

The scheduler 1203 determines a resource map at a current time point using a plurality of resource maps included in the memory 1201 and time information 1202 corresponding to a TTI or a system frame number and uses the resource map The scheduling is performed.

The resource allocation information generation unit 1204 generates resource allocation information for the terminals to which resources are allocated according to the scheduler 1203.

The transmitting unit 1205 transmits the generated resource allocation information to the corresponding terminal.

FIG. 13 is a block diagram showing a structure of a terminal device according to a third embodiment of the present invention, and shows a terminal device according to the resource allocation method shown in FIGS. 8 and 9.

Referring to FIG. 13, a reception unit 1301 of a terminal receives a signal transmitted from a base station.

The resource allocation information decoder 1304 decodes the received resource allocation information and transfers the decoded resource allocation information to the allocated resource determiner 1304.

The allocation resource determination unit 1304 determines the allocated resource. At this time, the allocated resource determiner 1304 determines a resource map at the current time using a plurality of resource maps stored in the memory 1302 and time information 1303 corresponding to a TTI or a system frame number . That is, the resource map of the current time is determined using the received resource allocation information, the time information corresponding to the current TTI or the system frame number, and the resource allocated at the current time is determined.

<Example 4>

In the fourth embodiment of the present invention, a method of varying the size of a resource allocated according to an indicator, including an indicator in a resource allocation signaling, is provided so that a resource allocation size and a resource map are not set in advance.

14 is a diagram showing a method of signaling a resource unit using the indicator according to the fourth embodiment of the present invention. First, assuming that two types of resource sizes can be allocated, basic signaling is configured using a bitmap method based on a resource size of a large size.

Referring to FIG. 14, a system 1401 has two PRBs as resource allocation units in a system having 50 PRBs.

If the BS sets the indicator included in the signaling to type 1, the BS allocates the resources in units of two PRBs.

On the other hand, if the indicator included in the signaling is set to type 2 as in 1402, resources are allocated in units of one PRB. Here, in the case of the type 2, since the total number of resources to be allocated is fifty, the number of resources that can be informed by using 25 bits becomes half. Therefore, in the case of the type 2, only the resources located at the odd positions are allocated in units of two PRBs as in 1404 and 1405.

Accordingly, resources located at even-numbered positions in units of two PRBs, such as 1406, allocate resources using Type 1 in units of two PRBs.

As described with reference to FIG. 14, in the fourth embodiment, a method of signaling a plurality of PRBs as one resource unit and allocation of resources in a unit smaller than the resource allocation unit at an arbitrary position including an indicator.

&Lt; Example 5 >

In the fifth embodiment of the present invention, a method of assigning a resource using a unit in which a CQI is transmitted in setting a resource map is proposed. That is, the basic unit of the resource map is a transmission unit of the CQI, and provides a space for separating the resources within the one CQI transmission unit and using a small-sized resource. The fifth embodiment of the present invention will be described in detail with reference to Fig.

15 is a diagram illustrating a signaling method of a base station according to Embodiment 5 of the present invention.

15, in a signaling method of a base station, first, a plurality of resource blocks RB1 to RB24 are grouped into subbands (subbands) 1501 to 1608, Lt; / RTI &gt; transmits the CQI. Various methods can be used for CQI transmission, and the minimum unit is the sub-bands 1501 to 1508. The base station scheduler allocates resources 1511 to 1534 to the UEs after performing scheduling based on the CQI. Since the CQI is transmitted on the basis of the subbands 1501 to 1508, 1534 to the subband units (1501 to 1508). At this time, when the resources 1511 to 1534 are allocated based only on the subbands 1501 to 1608, resource efficiency is reduced in transmitting small data.

15, the even-numbered subbands 1502, 1504, 1506, and 1508 allocate the size of each of the subbands 1502, 1504, 1506, and 1508 as they are while the odd-numbered subbands 1501 and 1503 , 1505, and 1507 can be divided into resource block units included therein to allocate data. That is divided into sub-band 1501, so have the three resource blocks (RB1, RB2, RB3), a resource block (RB1 = R _1, 1511) and two resource blocks _{(RB2 + RB3 = R 2,} 1521) Each giving the possibility of assigning data. Similarly, sub-band 1503 is a resource block (RB7 = R _4, 1512) and two resource blocks (RB8 + RB9 = R _5, 1522), the sub-band 1505 is a resource block (RB13 = R _7, 1513) and two resource blocks (RB14 + RB15 = R _8, 1523), the sub-band 1507 is a resource block (RB19 = R _10, 1514) and two resource blocks (RB20 + RB21 = R ₁₁ , 1524). Therefore, the set of resources that can be allocated by the base station, that is, the resource map includes resources 1511 to 1514 having one resource block size, resources 1521 to 1524 having two resource block sizes, And resources 1531 through 1534 of the resource manager 1530. [

Depending on the size of the sub-band, the size of the resource divided in one sub-band may vary. The division of the sub-bands may be performed according to time, or a method in which different sub-bands are selected and divided according to the setting of the base station, and the frequency of division of the sub- &Lt; / RTI &gt; As the resource map is set on the basis of the CQI transmission unit, the terminal transmitting large size data locates and allocates one or a plurality of sub-bands having the best channel response to the CQI of the terminal, The terminal that transmits data is searched for one or a plurality of subbands having the best channel response according to the CQI of the subbands among the divided subbands and the divided resources included in the subbands A resource of an appropriate size in a good band can be allocated.

In addition, in the embodiment 5 of the present invention, the base station also presents a method of transmitting signaling to the terminal based on the resource map. Using the resource map, the base station can notify the resource allocated to the terminal in various manners. Hereinafter, two methods will be described.

The first signaling method uses the bit map method to directly inform the resource map. This method can maximize the scheduling flexibility, and can allocate a resource of a desired size desired by the terminal to an arbitrary terminal in a good bandwidth possessed by the terminal. That is, all the available resources are allocated using the bitmap as in 1541 of FIG.

The second signaling method allocates resources to the terminals that transmit small data using only the divided small resources (for example, one resource block), and allocates resources to the other terminals by using resources of other sizes than the small resources . That is, as shown in 1542 of FIG. 15, a size of a resource to be allocated by the base station is selected using a bit or a plurality of bits, and the resource of the selected size is allocated using the bitmap 1543, respectively. In FIG. 15, a resource of one resource block size is divided into resources of different sizes. A resource 1511 to 1514 composed of one resource block according to the indicator 1542 is informed as a bitmap 1544, and the remaining resources 1521 To 1534 are informed by using a bit map 1543 with different indicators. The size of the bitmap 1543 and the size of the bitmap 1544 may be compensated for by padding.

The second signaling method limits the scheduling flexibility to some extent but reduces the signaling overhead compared to the first method. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, It goes without saying that various modifications are possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, and equivalents thereof.

In the present invention that operates as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention can increase frequency selective scheduling gain while minimizing signaling overhead in resource allocation in an orthogonal frequency division multiple access communication system.

In addition, the present invention provides an advantage of maximizing reception performance by allocating resources in consideration of a channel condition and a buffer status of terminals, and by allocating resources variably.

In addition, the present invention provides an advantage of increasing resources efficiency of a terminal by receiving resources in different resource allocation units for each time information.

In addition, the present invention provides an advantage that a terminal receives an indicator indicating a different resource allocation unit, identifies an allocated resource through the defined resource allocation unit information corresponding to the indicator, and significantly reduces the signaling overhead between the base stations do.

Claims (32)

A method for allocating resources by a base station in a mobile communication system, Considering at least one of a channel state and a buffer state of at least one terminal, at least one resource unit resource including at least one resource block or at least one resource map including the at least one resource unit resource is set Process, And transmitting information on the at least one resource unit resource or the at least one resource map to the at least one terminal, Wherein the information on the at least one resource unit resource includes an indicator indicating the at least one resource unit resource. 2. The method of claim 1, And transmitting information on the at least one resource unit resource or the at least one resource map to the at least one terminal through a broadcast channel. 2. The method of claim 1, And transmitting information on the at least one resource unit or information about the at least one resource map to each of the at least one terminal using a higher signaling signal. The method of claim 1, wherein the at least one resource map includes resource-unit resources having irregular sizes. The method of claim 1, wherein the setting of the at least one resource map comprises: Determining a plurality of resource maps to use according to time information with the at least one terminal; Determining a current time information based on at least one of a transmission time interval and a system frame number; Selecting a resource map according to the identified current time information among the plurality of resource maps; And setting the selected resource map as a resource map to be used for the at least one terminal. delete 2. The method of claim 1, wherein the information about the at least one resource map includes an indicator indicating the at least one resource map. 2. The method of claim 1, And transmitting information about the at least one resource map to the at least one terminal in a transmission unit for transmitting information on the channel status from the at least one terminal. A method for allocating resources to a terminal in a mobile communication system, Wherein the information about at least one resource unit resource including at least one resource block set considering at least one of a channel status and a buffer status of the terminal or at least one resource map including the at least one resource unit resource Comprising the steps of: receiving information from a base station; And acquiring a resource allocated to the terminal based on the information about the at least one resource unit resource or the information about the at least one resource map, Wherein the information on the at least one resource unit resource includes an indicator indicating the at least one resource unit resource. 10. The method of claim 9, And receiving information on the at least one resource unit resource or information about the at least one resource map through a broadcast channel or an upper signaling signal. 10. The method of claim 9, wherein the at least one resource map includes resource-unit resources having an irregular size. 10. The method of claim 9, And receiving information on a resource map set according to current time information from the base station, Wherein the resource map set according to the current time information is a resource map selected according to the current time information determined based on at least one of a transmission time interval and a system frame number among a plurality of resource maps to be used by the terminal according to time information . 13. The method of claim 12, And acquiring a resource allocated to the terminal based on information on the at least one resource unit resource or information about at least one resource map according to the current time information. delete 10. The method of claim 9, wherein the information on the at least one resource map includes an indicator indicating the at least one resource map. 10. The method of claim 9, And receiving information on the at least one resource map in a transmission unit for transmitting information on the channel status in the terminal. In a base station in a mobile communication system, Considering at least one of a channel state and a buffer state of at least one terminal, at least one resource unit resource including at least one resource block or at least one resource map including the at least one resource unit resource is set A control unit, And a transmitter for transmitting information on the at least one resource unit resource or information about the at least one resource map to the at least one terminal, Wherein the information on the at least one resource unit resource includes an indicator indicating the at least one resource unit resource. 18. The apparatus of claim 17, And transmits information on the at least one resource unit resource or the at least one resource map to the at least one terminal through a broadcast channel. 18. The apparatus of claim 17, And transmits information on the at least one resource unit resource or information about the at least one resource map to each of the at least one terminal using a higher signaling signal. 18. The base station of claim 17, wherein the at least one resource map includes resource unit resources having an irregular size. 18. The apparatus of claim 17, Determining a plurality of resource maps to be used according to the time information with the at least one terminal, checking current time information based on at least one of a transmission time interval and a system frame number, Selects a resource map according to the information, and sets the selected resource map as a resource map to be used for the at least one terminal. delete 18. The base station of claim 17, wherein the information about the at least one resource map includes an indicator indicating the at least one resource map. 18. The apparatus of claim 17, Wherein the at least one terminal transmits information on the at least one resource map to the at least one terminal in a transmission unit for transmitting the information on the channel status at the at least one terminal. In a mobile communication system, Wherein the information about at least one resource unit resource including at least one resource block set considering at least one of a channel status and a buffer status of the terminal or at least one resource map including the at least one resource unit resource Comprising: a receiver for receiving information from a base station; And an acquiring unit for acquiring a resource allocated to the terminal based on the information about the at least one resource unit resource or the information about the at least one resource map, Wherein the information on the at least one resource unit resource includes an indicator indicating the at least one resource unit resource. 26. The apparatus of claim 25, And receives information about the at least one resource unit resource or the at least one resource map through a broadcast channel or an upper signaling signal. 26. The terminal of claim 25, wherein the at least one resource map includes resource unit resources having an irregular size. 26. The apparatus of claim 25, Receiving information on a resource map set according to current time information from the base station, The resource map set according to the current time information is a resource map selected according to the current time information determined based on at least one of a transmission time interval and a system frame number among a plurality of resource maps to be used by the terminal according to time information . 29. The apparatus of claim 28, And acquires a resource allocated to the terminal based on information on the at least one resource unit resource or information about at least one resource map according to the current time information. delete 26. The terminal of claim 25, wherein the information about the at least one resource map includes an indicator indicating the at least one resource map. 26. The apparatus of claim 25, Wherein the terminal receives information on the at least one resource map in a transmission unit for transmitting information on the channel status in the terminal.

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